Lighting means



LIGHTING MEANS. APPLICATION FILED MAYIO. 1911.

1,352,252. PatentedSept. 7, 1920.

j V Il/VVENTOR UNITED STATES ETHAN I. nonros, or PITTSBURGH,PENNSYLVANIA, VAISSIGNOB, To .FLANNERY,BOLT

COMPANY, OF PITTSBURGH, PENNSYLVANIA.

LIGHTING MEANS.

Specification of Letters Patent. Patented S te pt. 7,

- Application filed May 10, 1917. Serial No. 167,725,

To all wkomz't may concern:

Be it known that I, ETHAN I. Donns, av citizen of the United States, anda resident of Pittsburgh, in the county of Allegheny 5 and State. ofPennsylvania, have invented certain new and useful Improvements inLighting Means; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will en- 1 ableothers skilled in the art to which it apof light, will become luminousand rema n so for an appreciable period of time, and radiate the lightso produced and stored.

With this object .in view, the invention consists in certain novelfeatures as hereinafter set forth and pointed out in the claim. Theaccompanying drawing is a view in section showing an embodiment of my invention. v

1 represents a transparent globe having on its interior surface a thincoating 2 of phosphorescent material which will absorb light rays andemit the same for a period of time, The material which I propose to useconsists of a suitable oxid or zinc or calcium sulfid having mixedtherewith an infinitesimal quantity of radium, which may be'in the formof a salt of radium. The amount of I radium used may be so. small thatthe globe will not be luminous in the dark, but when a light is placedin the globe, for a brief perlod, the rays will be absorbed by thecoating, the scintillations darting back and forth, and the coating andtherefore the 40 globe will be rendered luminous and will remain so foran appreciable period after the artificial light shall have beenextinguished or removed.

witness.

' A flash of light within the globe will Sui fice to excite theluminating coating and such flashes. may be repeated as occasion mayrequire, or the coating might be energized with the use of sunlight.

The coated: globe 1 may besealed by a cup 3 which carries anincandescent electric lamp 4,--said cup. containing an electro- PATENT"OFF-ICE,

magnet 5, the coil ofwhicli may be included in series with the lampfilament in an electric circuit containing a switch 6, or if desired, a

permanent magnet may beemployed,- The switch may be held normally openby a spring 7. The light-absorbing coating in-the globe is thus broughtwithin the zone' of magnetic lines of force and,I ha. ve found that thebrilliancyof,theglowof the coatin will thereby be enhanced.

glow brilliantly when in the zone-0f a magnet;.'and which can beenergized by sunmeans for providing a magnetic field in the zone of saidcoating; i

Intestimony whereof, I have signed-this y improvements provide a coldlight; one which can be handled without "bad effects, either tothe-eyesorto the body; one which will" glow under water; which willlightand still increase in intensity when in specification in the presence ofa subscribing 1 Witness: 5

F. H. ALLIsoN.

ETHAN Donns- I claim'as new and desire to secure by'Let-

